Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7ab02e34cc5da…

MALICIOUS

PDF

899.6 KB
MD5: 42308d4357ec523134a7dbdffae1dedd SHA-1: afd32608ef73f0b8aeff8f3d30c98ee370a86f0e SHA-256: c3e7ab02e34cc5da2186a0655f12ea54ad308c7d4e52f50dbf3f993a84540c8a
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The PDF_ENCRYPTED_WITH_JS heuristic suggests that the JavaScript is used to obfuscate or hide the actual malicious payload. The presence of ASCIIHexDecode filters further supports the idea of data manipulation for evasion. While the specific intent of the JavaScript is not fully discernible due to obfuscation, it is highly probable that it is used to download and execute a second-stage payload or redirect the user to a malicious site, characteristic of phishing or malware distribution.

Heuristics 6

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
4883d99b5e21891965222a8c54021c8c6185849f7093801b8b82da6bd9da88ce		 pdf-javascript-stream PDF /JS object 29 at offset 0x1E2C 8603 bytes

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